ALL BALL NERVE CENTER — NBA players work on their games in the summer, and try and find ways to be better than they were when the season ended. Last season, Atlanta Hawks guard Dennis Schröder had a big campaign, becoming the Hawks’ back-up point guard and getting regular playing time. Schröder shot 43-percent from the three-point line on the season, well above the league average of 35-percent. But Schröder apparently wants to extend that range.